Does Your Code Measure Up?
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After days, weeks, or months of coding many developers don't know how to gauge the quality of their code. Adam Culp will introduce tools to grade, benchmark, and analyze code in an automated fashion allowing developers to write better quality software. He will explain key metrics to help understand what may need to be refactored, and use code smells to point out bugs before end-users discover them. Attendees will see how to use these tools, know where to find them, and be able to implement them in their own workflows.
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Does Your Code Measure Up?
- 1. Does Your Code Measure Up? By: Adam Culp Twitter: @adamculp
- 2. 3 Does Your Code Measure Up? ● Fan of iteration – Pretty much everything requires iteration to do well: ● Long distance running ● Judo ● Development ● Evading project managers ● Code Quality!
- 3. 4 Does Your Code Measure Up? ● How To Measure? – Not productive
- 4. 5 Does Your Code Measure Up? ● Bad Music – Not a song writer
- 5. 6 Does Your Code Measure Up? ● How To Measure? – More accurate, quantifiable
- 6. 7 Does Your Code Measure Up? ● Why Measure? – Highlight bugs
- 7. 8 Does Your Code Measure Up? ● Why Measure? – Highlight bugs – Improve quality ● Easier onboarding ● Less reading, more writing ● Testable
- 8. 9 Does Your Code Measure Up? ● Why Measure? – Highlight bugs – Improve quality ● Easier onboarding ● Less reading, more writing ● Testable – Satisfied customers ● Faster development ● Less broken
- 9. 10 Does Your Code Measure Up? ● Why Measure? – Highlight bugs – Improve quality ● Easier onboarding ● Less reading, more writing ● Testable – Satisfied customers ● Faster development ● Less broken – Personal pride
- 10. 11 Does Your Code Measure Up? ● Why Measure? – Highlight bugs – Improve quality ● Easier onboarding ● Less reading, more writing ● Testable – Satisfied customers ● Faster development ● Less broken – Personal pride – Higher salary
- 11. 12 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity ● “The count of the number of linearly independent paths through the source code.” - wikipedia ● Decision points ● Less than 10 (personally less than 6)
- 12. 13 Does Your Code Measure Up? ● Cyclomatic Complexity Example
- 13. 14 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity – Duplicate code ● Rule of 3
- 14. 15 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity – Duplicate code – Long classes ● Less than 1,000 lines ● Classes solve a (1) problem
- 15. 16 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity – Duplicate code – Long classes – Class Complexity ● Less than 50
- 16. 17 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity – Duplicate code – Long classes – Class complexity – Long methods ● Less than 100 (personally less than 20) ● Method should do one thing
- 17. 18 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity – Duplicate code – Long classes – Class complexity – Long methods – Unused variables
- 18. 19 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity – Duplicate code – Long classes – Class complexity – Long methods – Unused variables – Lack or overuse of comments ● Clear, concise, not explain bad code
- 19. 20 Does Your Code Measure Up? ● Comment Example
- 20. 21 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity – Duplicate code – Long classes – Class complexity – Long methods – Unused variables – Lack or overuse of comments – Heavy global usage
- 21. 22 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity – Duplicate code – Long classes – Class complexity – Long methods – Unused variables – Lack or overuse of comments – Heavy global usage – Npath complexity ● Possible paths through code ● Less than 200 paths
- 22. 23 Does Your Code Measure Up? ● What To Measure? – Cyclomatic complexity – Duplicate code – Long classes – Class complexity – Long methods – Unused variables – Lack or overuse of comments – Heavy global usage – Npath complexity – Much, much, more ● Code smells
- 23. 24 Does Your Code Measure Up? ● Code “smells” – What are “smells”? ● Indications of spoiled code nearby ● Not conclusive ● The “smell” is not bad
- 24. 25 Does Your Code Measure Up? ● Common Code “smells” – “Smells” hinting a refactor may be needed: ● Duplicate Code (rule of 3) ● Long Methods ● Large Class ● Long Parameter (argument) List ● Switch Statements – sacrifice polymorphism ● Temporary Field/Variable ● Comments – where comments cover bad code
- 25. 26 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED
- 26. 27 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED – https://github.com/exakat/php-static-analysis-tools
- 27. 28 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED ● PHPLoc
- 28. 29 Does Your Code Measure Up? ● PHPLoc Results
- 29. 30 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED ● PHPLoc ● PHP_Depend - https://pdepend.org/
- 30. 31 Does Your Code Measure Up? ● PHP_Depend Result – Graphs and XML output ANDC AHH NOP NOC NOM LOC CYCLO NOM CALLS FANOUT9891 96646 66812 395815 23359 342 3192 0.585 0.442 9.333 7.318 16.945 0.169 0.102 4.137 Generated by PHP_DependLow Average High
- 31. 32 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED ● PHPLoc ● PHP_Depend ● PHP Copy/Paste Detector
- 32. 33 Does Your Code Measure Up? ● PHP Copy/Paste Detector Result
- 33. 34 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED ● PHPLoc ● PHP_Depend ● PHP Copy/Paste Detector ● PHP Mess Detector – Codesize
- 34. 35 Does Your Code Measure Up? ● PHP Mess Detector Result (codesize)
- 35. 36 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED ● PHPLoc ● PHP_Depend ● PHP Copy/Paste Detector ● PHP Mess Detector – Codesize – Unused
- 36. 37 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED ● PHPLoc ● PHP_Depend ● PHP Copy/Paste Detector ● PHP Mess Detector – Codesize – Unused ● PHP Dead Code Detector – Searches for code no longer used
- 37. 38 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED – PHPMetrics ● http://phpmetrics.org
- 38. 39 Does Your Code Measure Up? ● PHPMetrics Results
- 39. 40 Does Your Code Measure Up? ● Tools – PHPqatools.org – DEPRECATED – PHPMetrics – PHP_Codesniffer ● Create rules/sniffs to ensure standards are followed ● From CLI, IDE, or via SCM hooks
- 40. 41 Does Your Code Measure Up? ● Containerized Tools – PHPLoc – PHPDepend – PHPMessDetector – PHPCopyPasteDetector – PHPMetrics – PHP_Codesniffer https://github.com/adamculp/php-code-quality https://hub.docker.com/u/adamculp/
- 41. 42 Does Your Code Measure Up? ● Docker Hub https://hub.docker.com/u/adamculp/
- 42. 43 Does Your Code Measure Up? ● Commercial Tools – Code Climate ● Build from Git/Github repo – Open = free – Private = $ ● GPA – like in high school, simple
- 43. 44 Does Your Code Measure Up? ● Commercial Tools – Code Climate – Scrutinizer
- 44. 45 Does Your Code Measure Up? ● Commercial Tools – Code Climate – Scrutinizer – Zend Server and Z-Ray ● Debugging, Code tracing, Error reporting
- 45. 46 Does Your Code Measure Up? ● Performance Tools – Apache Bench (apache2-utils in apt) ● How much traffic can you handle?
- 46. 47 Does Your Code Measure Up? ● Apache Bench Result
- 47. 48 Does Your Code Measure Up? ● Realtime profiling – Z-Ray
- 48. 49 Does Your Code Measure Up? ● Conclusion – Measure all the things! – Don't fear results, share them – Reduce complexity – Leave code cleaner than you got it – Learn to “smell” problems – Use refactoring to fix shortcomings – Love iteration!
- 49. 50 ● Thank you! – http://phpqatools.org https://github.com/exakat/php-static-analysis-tools – http://phpmetrics.org – https://github.com/adamculp/php-code-quality – http://zend.com – http://codeclimate.com – Please rate Adam Culp http://www.geekyboy.com http://RunGeekRadio.com Twitter @adamculp